Abstract
AbstractSustainable and environmentally friendly UV‐shielding materials offer new opportunities in the formulation of the next generation cosmetic products. Cinnamate‐functionalized cellulose nanocrystals (Cin‐CNCs) prepared by esterifying CNCs with cinnamoyl chloride display strong UV absorption and high visible light transmittance. They are suitable for use as UV‐shielding nanofillers for sunscreen and transparent polymer films. The aqueous Cin‐CNC dispersion is waterborne, alcohol‐free, nonwhitening, waterproof, photo‐stable, and possesses a high sun protection factor (SPF). The SPF of Cin‐CNC aqueous dispersion is more than twice that of a popular commercial sunscreen at similar concentration. The Cin‐CNCs can serve as UV‐shielding and reinforcing nanofillers in hydrophilic and hydrophobic polymer matrices. The polyvinyl alcohol and polystyrene films incorporated with Cin‐CNCs display excellent UV‐shielding capacity and their Young's moduli are significantly enhanced.
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